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September 2006

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Subject:
Impedance coupon design for differentials signal without reference plane
From:
Balasubramanian Krishnan <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Tue, 5 Sep 2006 20:11:09 +0530
Content-Type:
text/plain
Parts/Attachments:
text/plain (25 lines) 
Dear All,
      For an 13.56 MHz antenna trace (25 mil wide & 400 mm long) running
between 2 pins of a differential transceiver (Tx1 & Tx2) we want to
maintain dimensional tolerance of + / - 10 % (trace width & trace thickness
including masking)? What has to be specified in the fabrication notes for
this?
      There is no reference plane below this trace.  How to ensure the
impedance tolerance is within 10 %? How should be the impedance coupon
designed for this purpose to do TDR measurements?

Sincerely

K.Balasubramanian
Project Leader - Hardware.

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